Lyman r



L ROBERTS.

MULTIPLE BELLOWS PUMP.

APPLICATION FILED AUG.I6. I9I7.

1,307,459. Patented J une 24, 1919.

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//ofney NITED sTATEs PATENT onirica. i

LYMAN R. ROBERTS, OF RUTHERFORD, NEW JERSEY, ASSIGNOR TO UNDERWOOD'TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

MULTIPLE-BELLOWS PUMP.

To all whom t may concern.'

Be it known that I, LYMAN R. RoBpRTs, a citizen of the United States,residing 1n Rutherford, in the county of Bergen and State of New Jersey,have invented certain new and useful Improvements in Multiple-- BellowsPumps, of which the following is a specification.

This invention relates to an improvement in engines, etc., particularlyin air pump mechanism, and is a division of my application No. 99,-1-88,liled May 241, 1916 (now Patent No. 1,247,151, dated November 20, 1917).

For the purpose of obtaining a steady suction so as to operate pneumaticmechanism as in my application above-mentioned, a lmultiple unit pump isused. This is .in the form of a bellows motor having three suctionsections with a common storage section. The individual suction sectionsare driven from a common shaft and in a regular sequence, so as toobtain a continuous suction action, `and thereby maintain a constantvacuum in the so-called storage section.

The connection from the drive shaft to the suction sections is of anovel type, to give a noiseless action and with a minimum of friction.This includes a plurality of eccentrics, one for each suction section,and having their centers located on lines radiating from the common axisabout which they rotate, preferably at 120 from each other.

-The eccentrics are connected to the bellows of the individual suctionsections by bands or endless connections, which pass around theeccentrics and around the pulleys on the suction sections in the mannerof pulley drives. The action, however, is that of an eccentric ratherthan that of 'a pulley drive, the flexible connection traveling androtating the pulleys idly, so as to make a smooth driving connection.The flexible connections lare maintained taut, and the action of theeccentrics opposed, by springs connected to the bellows sections.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view.

Fig. 2 is a side view in elevation looking from left to right in Fig. 1.

The motor 1 is provided with a shaft 2, to which is secured a worm 3,driving a Specification of Letters Patent.

Patented June 24, 1919.

Divided and this application led August 16,

wormwheel 1 secured to a shaft 5. The shaft 5, by means of gearingindicated in general at 6, opera-tes mechanism of the pneumatictypewriter actuator, as explained more fully in my above-mentionedapplication. The shaft 5 also drives a vacuum pump 7, so as to furnishthe suction necessary to operate the various pneumatic actuators of thetypewriter operator. The vacuum pump 7 includes a storage section orchamber S, which is common to three active suction sections 9, 10 and11. The storage section 8 is separated from the suction sections 9 to 11by a partition (not shown) with separate valve passages. Thisarrangement is such that each of the sections 9 to 11 will tend to drawout the air from the storage section S and maintain the latter under aconstant vacuum. The action of this vacuum is opposed by a spring 12, sothat when any pneumatic actuator of the typewriter operator is connectedto the sec-- tion 8, in a `manner more particularly explained in mvabove-mentioned application, the air will be withdrawn from thepneumatic actuator, so as to cause an action of the same. Both thestorage section S and the pumping sections 9 to 11 are in the forni ofbellows havino' fixed and movable sides hinged together and connected bythe usual accordion plaiting. The movable sides of the sections 9 to 11are normal under a tendency to collapse by means of individual springs13.

The active pumping sections 9 to 11 are driven froln the shaft 5, so asto operate in rotation, thereby causing a constant ywithdrawal of theair from the storage section 8. This driving mechanism includes aplurality of eccentrics 14, 15 and 16, one for each of the sections 9 to11. These eccentrics are staggered relatively to each other, so thatthey will have their maximum torque at equallv spaced intervals as tothe rotation of the shaft 5. That is to say the centers of theeccentrics are located on lines radiating from the axis of the shaft 5,which lines are arranged at angles 120o from each other.

The eccentrics 14 to 16 are in the form of pulleys, which may be stampedout of sheet metal and are connected to pulleys 17, 18 and 19 on `theactive sections 9 to 11 by means of endless flexible connections, shownin the form of chains 20 to 22. The endless connections 20 to 22, whilethey travel in the manner of driving` pulleys, are in reality flexibleeccentric rods and eccentric straps combined. The flexible connections2O t0 `22 are maintained taut by the springs 13, which also return thesuction sections to a collapsed condition. This driving arrangement ofthe suction sections is noiseless, and has the friction reduced to aminimum.

The action of the device is readily understood when taken in connectionwith the above description. The pump 7 proper is provided with the usualvalves an'd passages, so that as each of the 'sections 9 to 1l collapsesunder the pull of its associated spring 13, it forces out the airpreviously withdrawn from the common vacuum chamber or section 8. JThissection 8 is connected to I'the sections 9 to ll by individual passagesand valves and acts as a storage of vacuum. in other words, it providesan inclosed space or chamber having less air pressure th-an the spacesurrounding the chamber. This cnables the air to be Withdrawn from anypart connected to the storage section 8.

The sections 9 to l1, being driven in rotation, provide a constantsuction on the section S, as they are connected individually theretowith the usual passages and valves. This is provided for by the drivesfrom the shaft 5 to the sections 9 to l1 -wliich act in regularsequence, 'due to tlieregular spacing of the eccentrics l-l to 1'6around kthe shaft 5 preferably at angles of l2()O from each other. Bycombining the eccentric, strap and connected roller in one continuousflexible member, the friction is reduced and also the noise.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus1describedmy invention, I claim:

l. The combination with a pneumatic pump having a plurality of pumpingclements, each provided with la pulley, of a drive shaft for saidelements, eccentrics mounted on said shaft, end-less flexibleconnections running over said eccentrics and said pulleys and therebydriving said pumping elements, and springs individual to said elementsmaintaining said iiexible yconnections taut.

2. The combination with a pneumatic pump, of a -shaft for driving saidpump, an eccentric pulley mounted on said shaft, a pulley connected tosaid pump, an endless nection taut.

3. y The combination With a vacuum pump, of a` shaft for driving saidpump, continuously traveling endless flexible reciprocating connectionsbetween said shaft and said pump, for lenabling said shaft .to actuatesaid pump, and means for maintaining the connections taut.

4. The combination with a pneumatic piu'np including a plurality ofindividuallyoperable sect-ions, a sliaft'for driving said pump, andindividual driving.connections between said shaft and each of saidsections, said driving lconnections being staggered relatively Ito `eachother, so as to afford a regular continued action of said sections, eachof said driving connections including a continuously traveling `flexibleendless element enabling [the rotary movement of said shaft to operatesaid sections, and means to maintain said endless elements taut.

5. The combination with a pneumatic pump having threeseparately-operablesectious,.of a shaft for driving said pump, a plurality ofy eccentricpulleys secured ou said shaft at angles of 120O to each other., so as tobe evenly distributed around said shaft', an idle .pulley,connected toeach of said pump sections, andan endless connection wrapped around cachof said pairs of idle and eccentric pulleys, so as to forni combinedtraveling :iuil reciiirocatingdriving connections between the shaft andthe pump sections.

@..The combination .with a .pneumatic pump having threeseparately-operableA sections, of va. shaft for driving said pump, aplurality of eccentric pu'll-eys securedion said shaft at angles of120C? to .eacliother,.so as `to be even-ly distributed around saidshaft, yan vidle pulley connectedto` eachof said pump sections, anendless.' connection wrapped around eaclii of saidpai-rs of idle andeccentric pulleys, so as to forni combined traveling and reciprocatingdriving connections between the shaft and the pump sections, and a.spring individual to. each of said pump ysections for opposing theact-ion of the associated reccentric andinaintainmg `theassociatedgflexible connection taut.

LYMAN R. ROBERTS.

Copies of this patent may be obtained for vecents each, by addressingthe Commissioner lof Patents, Washington, D. C.

